Configuring Read Replica

Users can enter required information for Read Replica through the Samsung Cloud Platform Console and create the service through detailed options.

Configuring Replica

Through Replica configuration, you can create replica servers for read-only or disaster recovery purposes. You can create up to 5 Replicas per Database.

Follow these steps to configure Replica.

1. Click the All Services > Database > PostgreSQL(DBaaS) menu. You will move to the PostgreSQL(DBaaS)’s Service Home page.
2. On the Service Home page, click the PostgreSQL(DBaaS) menu. You will move to the PostgreSQL(DBaaS) List page.
3. On the PostgreSQL(DBaaS) List page, click the resource to configure Replica. You will move to the PostgreSQL(DBaaS) Detail page.
4. Click the Configure Replica button. You will move to the Configure Replica page.
5. Enter information in the Configure Replica area and then click the Complete button.

   Category	Required	Detailed Description
   Region	Required	Region to configure Replica Only exposed when Replica Configuration(Other Region) is selected
   Replica Count	Required	Number of Replicas to configure Can configure up to 5 per cluster When selecting a value of 2 or more, additional input is required for Replica name and service type information
   Replica Name	Required	Replica server name Enter 3 ~ 19 characters starting with lowercase English letters, using lowercase letters, numbers, and special characters(-) The entered Replica name is displayed as cluster name in the list
   Service Type > Server Type	Required	Replica server type Standard: Standard specifications commonly used High Capacity: Large-capacity servers with 24vCore or more
   Service Type > Planned Compute	Optional	Status of resources with Planned Compute set In Use: Number of resources with Planned Compute set that are currently in use Set: Number of resources with Planned Compute set Coverage Preview: Amount applied by Planned Compute per resource Create Planned Compute Service: Moves to Planned Compute service application page For details, refer to Applying for Planned Compute
   Service Type > Block Storage	Required	Block Storage settings for Replica DB Basic OS: Area used on the server where DB is installed Applied identically according to the Storage type set in the original DB Capacity setting is not possible DATA: Storage area for table data and archive files, etc. Applied identically according to the Storage type set in the original DB Capacity setting is not possible Additional: Storage area for DATA, Archive, TEMP, Backup data Applied identically according to the Storage type set in the original DB Only DATA, TEMP purposes can be added in Replica Select Use and then enter the storage purpose and capacity. Enter capacity in the range of 16 ~ 5,120 as a multiple of 8 To add storage, click the + button, to delete, click the x button. Can add up to 9.
   IP Access Control	Optional	Service access policy setting Sets access policy for IPs entered on the page, so no separate Security Group policy setting is required Enter in IP format (example: 192.168.10.1) or CIDR format (example: 192.168.10.0/24, 192.168.10.1/32) and click the Add button To delete entered IP, click the x button next to the entered IP
   Maintenance Period	Optional	DB maintenance period When Use is selected, set day of week, start time, and duration It is recommended to set a maintenance period for stable DB management. Patching is performed at the set time and service interruption occurs If set to Not Used, Samsung SDS is not responsible for problems caused by unapplied patches.
   Tags	Optional	Add tags Click the Add Tag button and then enter or select Key, Value values

   Table. PostgreSQL(DBaaS) Replica Configuration Items

Reconfiguring Replica

In case of network failure or Replication delay with Master Cluster, you can replicate Master Cluster data again through the Replica reconfiguration function.

Follow these steps to reconfigure Replica.

1. Click the All Services > Database > PostgreSQL(DBaaS) menu. You will move to the PostgreSQL(DBaaS)’s Service Home page.
2. On the Service Home page, click the PostgreSQL(DBaaS) menu. You will move to the PostgreSQL(DBaaS) List page.
3. On the PostgreSQL(DBaaS) List page, click the resource to reconfigure Replica. You will move to the PostgreSQL(DBaaS) Detail page.
4. Click the Reconfigure Replica button. The Reconfigure Replica Notification popup window will open.
5. In the Reconfigure Replica Notification popup window, click the Confirm button.

Promoting Replica Cluster to Master Cluster

You can promote a configured Replica Cluster to Master Cluster.

Follow these steps to promote Replica Cluster to Master.

1. Click the All Services > Database > PostgreSQL(DBaaS) menu. You will move to the PostgreSQL(DBaaS)’s Service Home page.
2. On the Service Home page, click the PostgreSQL(DBaaS) menu. You will move to the PostgreSQL(DBaaS) List page.
3. On the PostgreSQL(DBaaS) List page, click the resource to promote to Master. You will move to the PostgreSQL(DBaaS) Detail page.
4. Click the More button and click the Master Promotion button. The Master Promotion Notification popup window will open.
5. In the Master Promotion Notification popup window, click the Confirm button.